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optimize image files #52

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opened 2021-06-02 09:12:24 +08:00 by sb10q · 2 comments
sb10q commented 2021-06-02 09:12:24 +08:00
Owner

The latest PNG image files that I have added e.g. images/Thermostat@2x.png (d8a1f50f9b) are a bit too large.
Contrary to the ones created by @sovanna, they use 24bpp color and instead of an indexed palette, which helps explain the file size.
Converting to indexed using The GIMP results in unacceptable picture quality.
Apparently there are other tools that can give better results, but @sovanna does not remember which one he used.

The latest PNG image files that I have added e.g. images/Thermostat@2x.png (https://git.m-labs.hk/M-Labs/web2019/commit/d8a1f50f9b12a9425c9fe99b48164934af7ecf91) are a bit too large. Contrary to the ones created by @sovanna, they use 24bpp color and instead of an indexed palette, which helps explain the file size. Converting to indexed using The GIMP results in unacceptable picture quality. Apparently there are other tools that can give better results, but @sovanna does not remember which one he used.
occheung was assigned by sb10q 2021-06-02 09:12:24 +08:00
occheung commented 2021-06-03 14:52:22 +08:00
Collaborator

Tried Gimp, ImageMagick, mtPaint and pngnq on Thermostat@2x.png.
Here are the results:

Gimp:

ImageMagick:

mtPaint:

pngnq:

Tried Gimp, ImageMagick, mtPaint and pngnq on `Thermostat@2x.png`. Here are the results: Gimp: ![](https://git.m-labs.hk/attachments/78e48d64-0a65-4940-8912-2e79a625fe47) ImageMagick: ![](https://git.m-labs.hk/attachments/32ccd1a4-dfb0-48be-b08e-960dc1ad2d9f) mtPaint: ![](https://git.m-labs.hk/attachments/1244f55e-7a5d-4c7d-93c7-d85e25414b3e) pngnq: ![](https://git.m-labs.hk/attachments/062bf38a-0d47-4d04-9352-472b43d13c9a)
imagemagick_thermostat.png
31 KiB
gimp_thermostat.png
46 KiB
mtpaint_thermostat.png
50 KiB
pngnq_thermostat.png
59 KiB
sb10q commented 2021-06-03 14:53:47 +08:00
Poster
Owner

Seems pngnq is the way to go

Seems pngnq is the way to go
sb10q closed this issue 2021-06-03 15:21:02 +08:00
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Reference: M-Labs/web2019#52
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